Table 3.2.9 Familial association in the lifetime risk of developing colorectal cancer
| Familial association | Lifetime risk |
|---|---|
| Source: Keighley, 2003.324 | |
| More than two first degree relatives affected | 1:3 |
| Two first degree relatives affected | 1:6 |
| One first degree relative aged <45 years affected | 1:10 |
| One first degree and one second degree relative affected | 1:12 |
| One first degree relative aged >45 years affected | 1:17 |
| General population | 1:50 |